Perhaps the only joke that crosses all known cultures, races, and religions. A formula for laughter as old as comedy itself, fatty fall down occurs when a fatass falls over.
Dick: "Dude, did you see that lard butt tumble off the stairs?"
Johnson: "Yeah, dude, everyone was laughing their asses off. Even the fat guy was, and he was shaking like a plate of Jell-O."
Dick: "Fatty fall down never fails, man."